Two-stroke-cycle explosion-motor.



F. PlLAlN.

TWO-STROKE CYCLE EXPLOSION MOTOR.

APPLICATION FILED DEC- I2. 1913- Patented July 20, 1915.

4 SHEETS-SHEETI Q FIG-l Cl Mizzeases c N o r U m s A w o c n P A R o o N A L P M m A u L a c F. PILAIN. TWO-STROKE CYCLE EXPLOSION MOTOR.

APPLICATION FILED DEC. I2. 1913.

4 SHEETS-SHEET 2- Patented July 20, 1915.

F. PlLAlN.

TWO-STROKE CYCLE EXPLOSlON MOTOR. APPLICATION FILED 050.12, 1913.

1, 147, 1 1 8. Patented July 20, 1915.

4 SHEETS-SHEET 4. 5

Mir/6.9.566 liwfilaibr FRANQOIS PILAIN, OF LYON, FRANCE.

TWO-STROKE-CYCLE EXPLOSION-MOTOR.

Specification of Letters Patent.

Patented July so, 1915.

Application filed December 12, 1913. Serial No. 806,251.

To all whom it may concern:

Be it known that I, FRANQOIS PILAIN, a citizen of the French Republic, residing at Lyon, in France, have invented certain new and useful Improvements in Two-Stroke- Cycle Explosion-Motors, of which the following is a specification.

This invention relates to improvements in two stroke cycle explosion motors.

Hitherto two stroke cycle explosion motors have been of low power and defective operation; these imperfections are partly due tothe difliculties found in diminishing the weight of the motive and distribution parts. The use of pistons in tandem, that is to say, of a motor piston of which the lowerpart of larger diameter is provided with packing rings and actsas a pump piston, conduces to a heavy motor piston of.

complicated shape.

The present invention has for its object a distribution device for two cycle motors tudinal section of a motor when the motor piston is at the end of the up stroke, at the moment of ignition and when the pump piston, which is integral with the sleeve valve, finishes driving out the burnt gases. Fig. 2is a similar view when the sleeve valve uncovers the ports for the first stage of exhaust and 'when the pump piston has commenced to create the vacuum. Fig. 3 illustrates the motor at the second stage of exhaust; the pump piston having formed the complete vacuum, sucks in the burnt gaseswhich remain in the cylinder at the same time that the fresh gases enter the cylinder at the upper part thereof. Fig. 4 illustrates the parts at the moment of evacuation of the burnt gases by the sleeve valve which at the same time obstructs all the ports, and also illustrates the compression of the gaseous mixture bythe motor piston. Figs. 5 and 6 are cross sections of the cylinder on the lines 5-5 and 66 of Figs. 1 and 3.

The motor comprises a double bore cylinder, the upper part A which constitutes the motor cylinder proper and the part B of larger diameter, concentric to the former and serving for the suction and exhaust of the burnt gases.

The relationship of the capacities gen erated by the pistons is calculated with a view to insure the most perfect possible filling of the motor cylinder. The cylinder A has a circular orifice C by which it communicates with an annular chamber G into which the carbureted gases are introduced through the pipe D. .Below this chamber C is a second annular chamber E 'serving as conduit for the burnt gases which are evacuated at F.

The-cylinder B has at its upper part a port G by which it can communicate with the collector H. a i

In the cylinder A a sleeve I fixed to the pump piston J moves. This sleeve has at its upper part ports K arranged circularly, at its middle other portsL also arranged circularly, and at the lower part an enlargement provided with packing rings J forming the pump J. This sleeve is given an irregular alternating movement by gearing operated by the motor shaft and of which the point of attachment P to the sleeve is considerably ex-centered with regard to the axis of the latter, that is to say is ofiset from the vertical line passing through the center of the crank circle.

The displacements to which the sleeve is subjected alternately bring the ports K opposite the inlet orifice C of the cylinder and the ports L opposite the circular orifice M, through which'the first stage of the exhaust is effected; this sleeve by the continuation of its descending movement forms by means of the said ports L communication between the cylinder A and an annular vacuum chamber N which produces the second period of the exhaust. :The pump during these movements of the sleeve sucks in and expels the burnt gases ofthe second period of exhaust.

At the moment of ignition (Fig. 1) the inlet orifices C and exhaust orifices M are obstructed by the sleeve; the inlet ports K and exhaust ports L of the sleeve are masked, the former in the space existing between the wall of the cylinder A and of the wall of the plug Q, the latter between the motor piston and the wall of the said cylinder; the motor piston commences its downward stroke while transmitting the power of the expanded gases until the ports L of the sleeve (the latter also moving downward) form communication with the chamber E by means of the orifice M; the first period of exhaust then takes place. The motor piston continuing to descend with the sleeve, the ports L establish the communication with the vacuum chamber N into which the remainder of the burnt gases are sucked, the vacuum having been obtained by the descent of the piston J. At the same time the ports K of the sleeve cause the inlet chamber C to communicate with the inside of the cylinder, and the fresh gases pass therein by the suction produced. The ascent of the motor piston begins somewhat in advance of the ascent of the sleeve, while' the suction of exhaust gases into the chamber N, accompanied by suction through the ports C and K, is continuing. Then, when the crank actuating the sleeve has passed its dead point (Fig. 3) it produces a quick upward movement of the sleeve, by virtue of the'offset position of the point P, and the. supply of fuel is thus cut offbefore compression due to ascent of the motor piston can force fuel back through the port C. The piston continuing to rise compresses the gases in the cylinder until it again reaches its highest position (Fig. 1), when the explosion is produced. During this rising movement of the motor piston and the sleeve, the burnt gases contained in the vacuum chamber N are expelled by the pump piston J; The port G of the vacuum chamber is closed and opened by a ring R, during the periods for the formation of the vacuum and for the exhaust of the gases, said ring being-given an alternating movement in the collector H by means of a combination of levers driven by an eccentric suitably keyed on the motor shaft, as diagrammatically illustrated in Figs. L4.

\Vhat I claim as my invention and desire to secure by Letters Patent of the United States is i 1. In a two stroke cycle explosion motor, the combination of a motor cylinder having an inlet port, a pump cylinder in alinement therewith, a sleeve valve having ports one of which is adapted to cooperate withthe said inlet port and reciprocatable within said cylinders, an annular pump piston fixed to said sleeve valve in the pump cylinder, and means for moving said sleeve valve and pump piston to create a vacuum in said pump cylinder during the explosion stroke of the motor, and at the end of said stroke to open the inlet port and also place the pump cylinder in communication with the motor cylinder through the other port in said sleeve valve, for the purpose set forth.

2. In a two stroke cycle explosion motor, the combination of a motor cylinder having an inlet port, a pump cylinder in alinement therewith, asleeve valve having ports one of which is adapted to cooperate with the said inlet port and reciprocatable Within said cylinders, an annular. pump piston fixed to said sleeve valve in the pump cylinder, andmeans for moving said sleeve valve and pump piston to create a vacuum in said pump cylinder during the explosion stroke of the motor, and at the end of said stroke to open the inlet port and also place the pump cylinder in communication with the motor cylinder through the other port in said sleeve valve, the means for moving the sleeve valve including a crank and a connecting rod, the connection of said rod to the valve being offset in relation to the center of the crank circle, for the purpose set forth. 7

3. In a two stroke cycle explosion'motor, the combination of a motor cylinder, a

pump cylinder. in alinement therewith, said motor cylinder having an inlet port'and also an exhaust port intermediate of said inlet port andsaid pump cylinder, a sleeve valve having ports adapted to cooperate with the said inlet port and exhaust portrespectively andreciprocatable within said cylinders, an annular pump piston fixed to said sleeve valve in said pump cylinder, and means for moving said sleeve valve and pump piston to create a vacuum in said pump cylinder and to temporarily open said exhaust port during the explosion stroke of the motor, and at the end of said stroke to open the inlet port and also place the pump cylinder in communication with the motor cylinder, for the purpose setforth.

. 4. In a two stroke cycle explosion motor,

.the combination of a motor cylinder having a circumferential orifice, an inlet chamber for the explosive mixture surrounding said cylinder at the position of said orifice, a pump cylinder of larger diameter in extension of said motor cylinder and coaxial therewith and separated therefrom by an annular orifice, an annular exhaust chamher at the position of said latter orifice and communicating by a port with said pump cylinder, a collector in communication with said exhaust chamber, a reciprocatable sleeve having an annular series of ports adapted to be brought into communication with said circumferential orifice for the supply of motive fluid, and a second annular seriesof ports adapted to be brought into communication with said annular orifice and with the upper end of said pump cylinder for the exhaustof the burnt gases, a motor piston movable within said sleeve, an annular pump piston movable Within said pump cylinder and connected to the lower end of said sleeve and adapted to form a vacuum in the upper end of said pump chamber, means for opening and closing the communication between said exhaust chamber and said vacuum chamber,

and means for imparting reciprocating 10 movement to said sleeve.

In witness whereof I have signed this specification in the presence of two Witnesses.

FRANQOIS PILAIN. Witnesses:

JEAN GERMAIN, MARIUS MERMAZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

